Collapsible hack saw



Dec. 15, 1925- v E. W. MCINTIRE COLLAPSIBLE HACK. SAW

2 Sheets-$110M. 1

Filed May 6, 1921 Dec. 15, 1925- E. w. M INTIRE COLLAPSIBLB HACK SAW Filed lay e,' 1921' 2 Sheets-Sheet. 2

E .W. M Intire Patented Dec. 15, 1925.

UNITED STATES ERASTUS WILLIAM: 'IVICINTIRE, F IBICE, UTAH.

CGLLAISIBLE HACK SAW.

Application filed May 6,

To all whom it may concern Be it known that I, ERASTUS 1V. MoIN- TIRE, a citizen of the United States, residing at Price, in the county of Carbon andState of Utah, have invented certain new and useful Improvements in Collapsible Hack Saws, of which the following is a specification.

This invention relates to improvements in saws.

The primary object ofthe invention is the provision of a. hack saw including certain operating means for quickly 'tensioning a blade thereto.

A further object of the invention is the provision of a hack saw of the above described character, which is collapsible into a compact and folded longitudinal arrangement.

A further object of'the invention is the provision of a hack saw device of the above described character, which includes a blade adapted for adjustable disposition in either a vertical or a horizontal plane, with respect to-its supporting frame.

A further object of the invention 1s the provision of a hack saw of-the above described character, which is simple 11']. con stiai-ction, durable, and highly efii cient 1n withstanding usage ordinarily incident to hack saws.

Other objects and advantages will be apparent during the course of the following detailed description.

In the accompanying drawin gs, forming a part of this specification, and in which similar reference characters designate corresponding parts tln'oughout the several views:

Figure 1 is a side elevatlon of the improved hack saw showlng the same 111 position for operation.

Figure 2 is a side view of the collapsible hacksaw in its folded and collapsed position, ready for transportation.

Figure 3 is a plan view of the nnproved hack saw showing the same in collapsed position.

Figure 1 is a side elevation of the 1mproved hack saw showing the co-operation of various details thereof to tension a blade therein.

Figure 5 is a cross sectional view showing the cooperative manner of the various details thereof when the hack saw is collapsed.

Figure 6 is an enlarged fragmentary cross sectional view of a portion of the hack saw 1921. Serial No. 467,255.

frame showing the manner of attaching a blade thereto.

Figure 7 is a cross sectional view taken on the line 77 of Figure 5.

Figure 8 is a. perspective view of a detail used in adjusting a blade in the hack saw.

Figure 9 is a fragmentary view showing the method of attaching a blade to the hack saw. Figure 10 is a cross sectional view taken on the line 1010 of Figure 9.

In the drawings, wherein for the purpose of illustration is shown the preferred em bodiment of my invention, the letter A designates the collapsible frame work of the improved hack saw having a handle lever B pivotally mounted thereon. A blade C is adapted for detachable disposition on one end of the frame A, while the other end of said blade is detachably positionedupon an adjustable connecting link D pivotally mounted upon the handle'lever B.

The frame A preferably includes an up per bar 15, comprising a section 16 channel shaped in cross section and provided with the relatively long end socket or enlarged channel portion 17. A section 18 of the main supporting bar 16 is provided for adjustable disposition within the pocket 19 ofthe socket end 17, said socket end 17 being provided with overhanging flanges 20 adapted for retaining the section 18 from rocking with respect to the section 16. The section 18 is furthermore provided upon its bight outer surface with suitable notches 21 adapted for reception of a pawl projection 22, whereby the section 18 may be maintained in position in the socket end 17 in any adjusted position. Thus it can be seen that the sections 16 and 18 can be relatively moved to provide an adjusting supporting frame 15.

An end bar 25 is pivotally mounted by a. rivet 26 through a pair of upstanding legs 27 to an end of the section 16, said bar 25 being channel shaped in formation, and having its bight or curved side 28 so positioned that the same will contact the high: or HHClGI POItiOII of the frame 15 when said bar 25 is in its open position for operation, and as shown in Figure 4: of the drawings. The bar 25 is so pivoted upon the evtreme end of the section 16 that the same can be folded upwardly and over the edge of the section '16, which will subsequently be set forth. The bight portion 28 of the bar 25 terminates intermediate the ends of said bar to provide a pair of legs 29 and 30, unconnected save by the bight portion 28 up wardly upon the bar 25, and which structure has been provided to facilitate folding of the adjustable connecting link D onto the handle or lever B, and which will subse quently be described. The bar 31 forming an element of the frame A is channel shaped in formation and upwardly provided with a pair of arms 32, which are pivotally connected at 33 to the extreme outer end of the section 18, the bight or curved portion 3 1 of said channel shaped bar 31 being disposed similarly to the bar 25, so that when said bar 31 is in open position to form a frame structure for the saw, said bight portion 3 1 will upwardly contact at 35 to the under surface of the section 18 to hold said bar 31 in rigid position. This bar 31 is for folding upon the section 18 in a manner similar to the folding of the bar upon the sections 15, the pocket as provided by said bar 31 adapted to receive a portion of the section 18 substantially as illustrated in Figure 2.

The handle B is channel shaped in cross section and equal in length to the length of the bar 25, said handle B being provided with relatively wide legs 36 and 37. The bight portion 38 of the channel shaped handle B is outwardly curved at 39 upon the extreme ends thereof to conform to the ordinary saw handle formation. The handle 13 is pivotally attached to the lower or free ends of the legs 29 and 30 of the bar 25, the point of said pivoting attachment being the lower outer corner of each of the legs 36 and 37, which are pivotally and separately attached by rivets 10, whereby the pivoting attachment of the handle B to the bar 25 will form no obstruction to the movement of the adjusting connecting link I). The handle B is provided with a pocket sufficiently large to have the bar 25 disposed therein as shown in Figure 1 of the drawings, the placing of said handle B on the bar being limited by contact of the projecting ends of the rivets 2G in a suitable depression or recess 11 provided in the upper outer corner of each of the legs 37 and 38.

The blade C adapted for use with the improved hack saw is an ordinary hack saw blade, and the same may vary in length as desired. Said blade C is provided with the ordinary aperture 13 and ll upon its ends for detachable disposition upon the hack frame. An end of the blade C containing one of the apertures, such as aperture 13 is adapted for disposition upon the lower or free end of the bar 31 through a slot formed longitudinally in the bight portion 3st of said bar. The lower end of the bar 31 is provided adjacent said slot 45 with the reduced projection 16, partly in which the slot 45 is formed, and the sides of which are shorter than the sides of the bar 31 for a purpose to be set forth. A suitable projection 4C7, having an enlarged head 18 thereon, is provided inside of the channel socket 19, as provided in the reduced end 16; the top of said projection, projecting outwardly from the side upon which the same is formed for a sufficient distance that entrance to the pocket of the channel 31 from the slot 45 will be impeded by said projection 17.

In assembling a blade C to the bar 31, said blade C is tipped transversely of the bar 31, sul'istantially as illustrated in dotted lines in Figure 6 of the drawings, and inserted through the slot 45 in the bight portion 3 1 of said channel; said blade C being allowed to slide past the enlarged head 48 of projection 47, due to the tipping thereof, and due to the reduction of the sides on the end 46. When the blade has been inserted in the socket 19 of the channel 31 a suflicient distance, the same is straightened out until it contacts the enlarged head 18 of projection 47 and by sliding the blade back and forth in this socket, the aperture 43 in the blade will be placed in alignment with the projection #17 and will slip over the enlarged l head 48 of said projection, thus allowing the blade C to be placed in parallel relation to the frame A. lVhen the blade C is in this parallel position there will be no liability of the blade C becoming detached from the projection 17.

The adjusting connecting link D is of novel formation, and preferably includes a polygonal shaped nut 50 provided with the oppositely extending arms 51 and 52 upon opposite faces of said nut 50, said arms 51 and being adapted for pivotal disposition within the arms 36 and 37 respectively, of the lever handle B, and adjacent the pivotal connection of said lever with the bar It is preferred that the pivoting points of said nut 50 be disposed intermediate the pivoting conection' of the handle B with the bar 25, and the bight portion 38 of this handle B. The nut 50 is provided with a screw threaded aperture 53 extending therein, for the adjustable and detachable disposition of the screw threaded end 5 1 of the bolt member 55, forming a part of the link I). The bolt 55 is provided with a polygonal shaped shank portion 56, immediately adjacent the screw threaded portion 54;, said polygonal shaped shank portion 56 graduating into the circular portion 57. A hooked and relatively flat end 58 is provided upon the cylindrical portion 57, one side of said flat hook 58 being provided with a projecting pin 55), having an enlarged head 60.

The end of the blade C provided with the aperture @1- is adapted for attachment to the. connecting link D, said'aperture 44 besupported position upon thepins 59 and 47.

arcuate movement.

Due to the 'factthat hack saws are used for metal cutting and extreme work, the blade C must be maintained in'tension upon its supporting pins 47 and 59. This 'tensioning is effected by rocking the lever B fron'i'its open position as'illustrated in Figure 4, upon the pivot pins 40, until the handle B is closed to engage the bar in its pocket, and in which closed position as illustrated in Figure 1, the blade C will be su'lliciently tensioned for any operation desired. This tensioning is of course effected by reason of the arcuate movement of the link D upon its pivot arm 51 {111C 52 with respect to the rivets 40 as a center of said hen the blade C is beingtensioned, the arcuate movement will take place in such manner that the pivot of the link D will be moved away from the projection 47 upon the bar 31, which will have the tendency of further spacing the projections 47 and59 with respect to each other. Thus itcan'be seen that when a blade C is positioned upon the projections 47 and 59, that when closing the handle B, the natural consequence of the spreading of said projections with respect to each other will be the tensioning of the blade C. Due to the fact that the pivoting points as detined by the arms 51 and 52 lie upwardly of the pivoting connection of the handle B upon the bar 25, when said handle B is in closed position, it can be seen that the handle B will be maintained in locked position, and due to tensioning of the blade C there will be no liability of said handle B becoming ac cidentally open.

The bolt 55 isprovided for adjustment in the nut so that-any degree of tensioning on the blade G can'be effected; and to pro vide for the reception of different length enedblades C. \Vhen the hack saw is'in its operating assembled position, the polygonal shank portion 56 of the bolt will be disposed intermediate the blades 29 and 30 of 1 to the plane of the frame A, this being effect ed by disposing theaperture 43 over the projection (31 whichis formed upon the extreme end of the reduced portion 46 of the bar 41. Thisprojection 61 is provided with an enlarged head 62 to more readilymaintainthe aperture 43 over said pro'jectionGl. The aperture '44 is applied in the abovedescribed manner over the projection 59 ofthe bolt 55; theholt 55 is, however, rotated or oscillated at an angle of 90 sothatthe flat or hooked end 58 thereof lies in a horizontal plane and at right angles to the plane-defined by the frame A. lVhen thehandleor lever B is clamped in position over the bar 25, the blade C will be disposed in a hori-" zontal plane for operating upon work, and which plane will be at right angles to the plane of the frame A. v

In all operations the blade C is attached to the projections of the frame A and link D' when the handle B is in open position, as illustrated in Figure 4, in order that the blade C may be properly tensioned when the handle B is closed. Should various lengths of blades be used from time to time, the section 18 of the frame A is reciprocated-in' its pocket 19 of the member or section 15, to properly adjust the frame A tothe length of blade desired. This operation may notbe exact, and-consemrently it will be necessary to rotate the bolt 55 in its-nut 50 to properly adjust the connecting link D to tension a blade C in proper working relation to the frame A.

In collapsing the improved hack saw the handle 13 is first manually opened by rocking the same upon its pivot 40, thus relieving tension upon the'blade C. The blade C is next 'unhooked from its projection 59 on the bolt 55, said-blade C being tipped sideways and unhooked'fromprojection 47 to entirely detach the blade from the frame A. The blade C is next placed in the pocket of the upper bar 15, the teeth 65 of said blade C facing downwardly in the pockets of the members 16 and 18. The bar 31 is next swung upon its pivot 33 until the same overlies the section 18 in folded position as illustrated in Figure 2, thus lockingthe blade G in the main supporting bar 15. Since the handle Bis in open position, theconnecting link D is swung upon its pivot arms 51 and 52, toward the openhandle B, and by reason of the removed bight portion on the bar 25 to form the legs 29, said bolt 55 ofthe link 3 D can be swung pastthe bar 25 and into the pocket of the handle B between the legs 36 and 37 of said handle. The handle B is then opened by swinging upon itspivoting rivets 40 until the same is in longitudinal alignment with the bar 25. lVhen the handle B and bar 25 are in this longitudinal relation, the bar 25 is rocked upon the pivot 26 with respect tothe supporting frame 55, whereby the bar 25 and the handle B11121) be disposed over the section 16 of the main supporting bar 15 and enclosing the same. The handle Bwill properly overlie the enlarged portion 1? of'the section 15, said enlarged section 17 being )rovided with bosses n 3011 o 3 )osite sides thereof, whereby when the handle B is disposed over the enlarged portions 17, said bosses will fit into suitable depressions 71 formed upon the inside of the arms 36 and 37 of handle B, and thus securely maintain said handle B in frictionally locked position upon the supporting bar 15. and as illustrated in Figure 2 of the drawings, to hold the entire hack saw in folded collapsed position for transportation. In folded position all elements of the improved hack saw will be disposed in longitudinal parallel relation, and there will be no liability of loss of the blade C nor of swinging of the element D due to the fact that said parts are securely locked within the folded frame structure.

Various changes in the shape, size and arrangement of parts may be made to the form of the invention herein shown and described, without departing from the spirit of the invention or the scope of the claims.

I claim:

1. A saw, comprising a collapsible frame, said collapsible frame including a main supporting channel bar, end channel sect-ions pivotally connected to said mam supporting bar, a channel handle pivotally connected to the free end of one of said end channel sections, an adjustable connecting link pivotally connected in said handle, and a blade, said blade adapted for positioning in the groove of said cannel bar when in collapsed position, said end channel sections of sa d frame adapted for disposition over said main channel bar, and said handle adapted to contain said adjustable link therein and to be deachably disposed in frictionally locked position over said main channel bar.

2. A saw, comprising in combination a frame, a lever pivotally connected to one end of said frame, a nut oscillatively carried by said lever adjacent the pivot connection of said lever with said frame, a bolt adjustably disposed in said nut, and a blade adapted for connection to said bolt and to an end of said frame whereby upon rocking of said lever said blade will be tensioned between its supporting points to place the same in operating position.

3. As an article of manufacture, a collapsible saw frame including a connecting bar of channel material and end bars of channel material pivotally connected at the ends of said connecting bar whereby said end bars may be folded to receive adjacent portions of said connecting bar therein when the frame is folded, said end bars when extended to open the frame engaging said connecting bar to provide a substantiaally U- shaped rigid frame structure.

l. As an article of manufacture, a sew frame comprising a connecting bar arrangement including a pair of channel shaped sections, one of said sections having an enlarged end thereon to telescopically receive the end of the other section in adjustable relation, and end bars of channel formation pivotally connected on the outer end of said connecting bar sections.

5. A collapsible saw comprising a supporting frame including a main connecting bar of channel material and end bars pivotally connected to each of said main bar and of channel formation, a blade, and means for adjustably connecting the blade to the ends of said end bars in supported relation, said blade adapted for engagement in a pocket provided by the main connecting bar, said end bars adapted for folding over said main bar to maintain said saw within said main bar pocket.

6. A saw comprising a frame, a blade adapted for detachable connection to one end of said frame, a lever pivotally connected to said frame, a nut o-scillatively carried by said lever eccentrically of the pivot of said lever, a hook shaped bolt member adjustably carried by said nut in screw threaded engagement therewith and adapted for engaging the opposite end of said blade in detachable manner whereby the blade may be connected to said frame under tension.

7. A collapsible saw device comprising a fr. inc. 'icluding a connecting bar having a longitudinally extending pocket therein, end bars pivot ally connected to the ends of said inain connecting bar and including pockets for receiving the adjacent end portions of the main connecting bar therein when the frame is in folded relation, a blade, means for detachably connecting one end of said blade to an end of one of said frame end bars, a channel shaped handle member pivotally connected at an end to the outer end of one of said frame end bars and adapted for receiving said end bar in the pocket provided thereby when said handle is in operating position, and adjustable means pivotally and eceentrically carried by said handle with respect to its pivotal connection with the frame and adapted for engagement with the other end of said blade, said adjustable means adapted for folding within the pocket of said handle when the saw is to be collapsed, said blade being adapted for positioning in the longitudinal pocket of the main bar of said frame with the end bars of said frame folded thereover when the saw is to be collapsed, said handle when the saw is to be collapsed adapted for folding over said main bar with said adjusting means secreted therein.

8. A saw comprising a frame, a lever pivoted to said f 'ame, a nut, a bolt adjustable on said nut. a blade adapted for connection to said bolt and to said frame, means on said lever adjacent the pivot. connection for movably supporting the nut so that upon movement of the lever the blade may be tensioned.

ERASTUS YVILLIAM MoINTlRE.

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